Abstract
The main purpose of this study is to disclose relations between two phenomena in abnormal auditory adaptation, called threshold tone decay (TTD) and reduced amplitude in the Bekesy tracings, and modulating frequency of an amplitude modulated tone. Amplitude modulated tones at the various rates of modulating frequencies was made by modulating a 4000cps pure tone with an amplitude fluctuation of 3db in the form of trapezoidal change at the rates of 10, 20, 30, and 40cps of modulating frequencies. Both Bekesy audiometry and the self-recording TTD tests were performed for five ears with sensory neural type hearing impairment, which showed marked TTD and reduced amplitude for non-modulated pure tone.As a result of an increase in modulating frequency from 10cps to 40cps, the degree of TTD and reduced amplitude was remarkably enhanced. TTD and reduced amplitude for an amplitude modulated tone at the rate of 40cps in modulating frequency showed approximately the same values as those for a continuous tone.
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